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DaniilM [7]
4 years ago
9

A 10 kg block is attached to a light cord that is wrapped around the pulley of an electric motor, as shown above. At what rate i

s the motor doing work when it is pulling the block upward with an instantaneous speed of 3 m/s and an upward acceleration of 2 m/s

Physics
1 answer:
guajiro [1.7K]4 years ago
5 0

Answer:

the work done by the motor is 531,45 Joules

Explanation:

Using a sketch of the possible conditions, we need to find the distance that the block was moved, in order to find the work done by the electrical motor.

The sketch could be seen in the attached image.

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Hansel pushes a 2 lb. box 5 feet in 20 seconds. How much work has he done?
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You can see time doesn’t matter (if we were talking about power, which is the RATE at which work is performed, that would be a different story).

W = 2 x 5 = 10 foot-pounds of work

Foot-pounds are gross units. Better to work in SI units when you can!

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3 years ago
1. A rock of granite has a mass of 50 kg. if it’s weight in water
igor_vitrenko [27]

Answer:

The first part of the question is asking about BUOYANT FORCE or UPTHRUST.

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since the granite is completely submerged, the volume of the displaced liquid will be equal to the volume of the body.

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120N=V×1000kg/m³×10m/s²

120N=V×10000kg/m²s²

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v=0.012m³

please mark brainliest, hope it helped

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3 years ago
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What is found by multiplying frequency by wavelength?
vivado [14]

That's the <em><u>speed</u></em> of the wave. 

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